April 2001 - Zope-Dev

Re: [ZODB-Dev] External transaction integration bug in TM.py
by Jim Fulton 25 Apr '01

25 Apr '01

Sorry I took so long to reply. "Randall F. Kern" wrote: > > [Originally sent to zope-dev, but belongs here] I'm CCing zope-dev, since you posted there too. > I may just be missing something obvious here, but it seems like there is > a hole in ZODB.Transaction.Transaction.commit and Shared.DC.ZRDB.TM.TM, > that can cause external transactions (those that use the TM mixin class, > like psycopg) to be abandoned (never get committed or rolled back). > > Let's say somewhere around line 300 in Transaction.py (the call to > j.commit(o, self)) we get an exception. Furthermore, let's say the TM > derived database object has already been committed (the only effect of > which is to move the DB into the jars mapping, since TM.tpc_begin() and > TM.commit() both do nothing). > > The exception dumps us down to about line 353, where we call > _p_jar.abort() on all the uncommitted objects (note: it's important that > the database connection isn't in this list, because TM.abort() will > rollback the transaction. the way we keep the db out of this list is by > having it appear in objects _before_ the object that failed the commit). > > Next we reach line ~366, where we should "unwind TPC for the jars that > began it". What this means is calling tpc_abort() on each jar from the > objects that were already committed (which includes the database). > However, TM.tpc_abort() does nothing, leaving the external database > transaction open. > > Does this make sense? Yup, fraid so. > If this makes sense (i.e. seems bad :), does catching tpc_abort() in TM > and calling TM.abort() seem like a valid fix? This change certainly > seems > to fix the problems. Yes. I think this is an improvement. Thanks. I'll check this in. Jim -- Jim Fulton mailto:jim@digicool.com Python Powered! Technical Director (888) 344-4332 http://www.python.org Digital Creations http://www.digicool.com http://www.zope.org

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forking of the mailing list
by Andy McKay 25 Apr '01

25 Apr '01

There was a discussion on zope(a)zope.org about forking of the mailing list. Would there be any support behind a seperate ZPatterns list? There seem to be lots of users and lots of questions that arent of interest to people who dont use ZPatterns (like me). Cheers. -- Andy McKay.

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Re: [Zope-dev] "pydoc" for Zope - another great documentation finding tool
by Dieter Maurer 25 Apr '01

25 Apr '01

Zopista writes: > Yes please, I want to integrate pydoc in to the SourceCodeBrowser which is > at zopezen.org and I'm just to about to release as a product. The (minor) modification to let "pydoc" work with Zope can be found via URL:http://www.dieter.handshake.de/pyprojects/zope/pydoc.html "pydoc" requires installation and use of Python2.1. It seems that Zope need not be run with Python2.1 just "pydoc". But I made no thourough tests for this. Dieter

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Splitter.c hack by Spisak; anyone have a Splitter.so?
by Erik Enge 25 Apr '01

25 Apr '01

Hola, please don't make me touch C or a ... erm... you know, one of those compiler-thingys. I don't like them. Does anyone have a nicely baked Splitter.c for Linux? The one that Spisak hacked to make it chew and swallow anything? Fhank you very much. :-)

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ZPatterns Design Issue
by Roch'e Compaan 25 Apr '01

25 Apr '01

Hi Everybody We are porting a desktop application to Zope using Interbase and ZPatterns. In this application objects like Vintage, Farm, Vineyard, Block and Panel form a hierarchy and are displayed with the Zope tree widget. To build the hierarchy we use a method called getChildrenFor() on each level to retrieve the children for the object at hand. Behind getChildrenFor() lies a ZSQL Method on their respective racks to retrieve the result set. Building the tree leads to a whole bunch of queries to the database that really slows thing down ie. besides the queries that retrieve children, select queries to retrieve individual instances is called by getItem through SkinScript for each item in the tree. I haven't been able to figure out a way to get some performance back without talking to the database directly through ZSQL Methods but this defies the whole point of using ZPatterns. Some guidance/pointers would really be appreciated. Roché

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wxPython + ZODB = bliss
by Shane Hathaway 24 Apr '01

24 Apr '01

Here is a script that lets you browse *everything* in your ZODB through a quick GUI client. I was looking at wxPython the other day and this idea occurred to me. It worked amazingly well. http://www.zope.org/Members/hathawsh/pyTree (BTW you can't hold me responsible if your password slips out because of this. ;-) It runs outside the security model. ) I don't know how many of you have tried out wxPython but I think it's a marvellous GUI library. It's fast, stable, and in active development. It works as well under Python 2.1 as it does under 1.5.2. Just thought I'd give that little plug. :-) And when you mix wxPython with ZODB... it's pure bliss. I've been writing a little program on the side that uses wxPython and ZODB as a foundation, and I'm amazed at how well the project is coming together. I've heard rumors about a fat client for Zope that used a ZEO connection for editing (ZopeFish?)... I think this script demonstrates how well that idea would work! Shane

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deepcopy of file object
by Chris Withers 24 Apr '01

24 Apr '01

Hi, I've got an object of type OFS.Image.File and I want to make a copy of it. I can't use the ObjectManager stuff, 'cos this object is being stored in a BTree-ish thing in a quite different context from a Zope folder. For obvious reasons, deepcopy(myfileobject) fails with a copy.error 'cos I don't see the File class having a __deepcopy__ method. Has anyone got any ideas or things that I might haev overlooked. cheers, Chris

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ANN: new CalendarTag and other news
by palomar＠sg.uji.es 24 Apr '01

24 Apr '01

Hi all, I've working a little in a new CalendarTag, you can download it (version 2.0 alpha 1) from http://sourceforge.net/projects/lleu Be careful, its usage is somewhat different and will probably break the pages that use the old CalendarTag. It's not for production environments, it's mainly for getting feedback, if there's a feature you want to see in the new Calendar Tag let me know. Note that the new version depends on the product mxDateTime that you can also download from the same url. Other news, the Localizer product is updated, the version 0.1.1 fixes two bugs of the 0.1.0 version. If you're curious look at the CVS, there you'll find an unreleased product named "Content" (yes, it's not a very good name). Combining both the Localizer and Content it will be possible to easily build big multilingual web sites. Best regards, jdavid

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ZPivotTable
by florian_reiser＠gmx.de 24 Apr '01

24 Apr '01

Hi guys, I want to program a pivot table similar to the one M$ Excel has. I feel there's the need for it. For the planned features see http://www.zope.org/Members/freiser/PivotTable/ I've thought that it would be best if I would create the following classes: - Cell (The table cell) - Column (The table column) - Row (The table row containing columns and cells. Columns only if one or more columns are drilled down) - Table (The table itself) Could you give me some advice if I'm on the right path, and give me alternative design ideas? Greetings Florian -- ----------------------------------------------------------------------- | Florian Reiser PGP-Key:0x5368CF3F | | PGP-Fingerprint: 84C7 24BC F3A4 487F CBC7 692C 05DB 6E11 5368 CF3F | -----------------------------------------------------------------------

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hack for refused authorization with virtual dataskin
by Godefroid Chapelle 24 Apr '01

24 Apr '01

Hello, After rereading the ZopeSecurityPolicy source code, I tried the following hack. I add in the skinscript : WITH 1 COMPUTE __allow_access_to_unprotected_subobjects__=RESULT which does work : it fools the security mechanism. I can live with it but feel that there is only a slight problem which could allow me to avoid the hack. I hope this can hint some of you to help me to understand what is badly settled in my installation. -- Godefroid Chapelle BubbleNet sprl rue Victor Horta, 30 1348 Louvain-la-Neuve Belgium Tel 010 457490 Mob 0477 363942 TVA 467 093 008 RC Niv 49849

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